A string of stars are out of contract at the end of next month and are up for grabs.

There is already a scramble for free agents going on under the radar as some top flight talents look to secure their future.

Boro can’t afford to join the scrum of sides who will be jostling for the services of Emre Can, Jack Wilshire and Luke Shaw.

But there are some excellent prospects available this summer that may well interest Tony Pulis as he starts his summer rebuild.

We can’t know who exactly the gaffer will be targeting but here’s six free agents that caught our eye.

Ki Sung-Yueng

(Defensive midfielder, 29, Swansea)

Good engines, strong in the tackle and a versatile range of passing the 90 times capped South Korean international midfielder was one of the few bright spots in the Swans ill-fated battle against relegation.

Ki Sung-yueng in action for Swansea (Image: PA)

Ki is most often deployed as a defensive midfielder role but is comfortable further forward too and has scored 12 goals in 139 Premier League outings for Swansea.

He shelved talks on a new deal last season until he knew what division Swansea would be in. He has been linked with AC Milan in the past but is keen to stay in England.

Would be an attractive prospect but Boro would face stiff competition for him.

Bakary Sako

(Left wing, 30, Crystal Palace)

Strong, quick and direct with an instinct to cut into the box, the Mali international caused mayhem down the left wing at Wolves for three years before making a switch to the top flight with Palace.

He scored six in 19 last term but has struggled to nail down a regular slot at Selhurst Park and the frustrated flanker is keen for a fresh start.

And he knows the Championship. He scored 38 goals from the wing in 124 games at Wolves and would tick a lot of boxes for Tony Pulis.

Bakary Sako in action for Crystal Palace (Image: Getty Images Europe)

He would be a good fit in a problem position at Boro.

Martin Kelly

(Defender, 28, Crystal Palace)

The former Liverpool man was signed for Palace by Tony Pulis back in August 2014 but the Boro boss left the club before the new boy had even bedded in.

The versatile and athletic defender has most often been used at left-back and occasionally on the right at Palace under a string of different managers but he insists his natural position is as a central defender.

His height, physicality and versatility has attracted Pulis once before and now he has added experience too - 128 top flight games - so he could pique some interest.

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James Morrison

It is mandatory to mention Morrison in these pick ‘n’ mix selections but the former Boro man is such an obvious contender.

James Morrison of West Brom (Image: Ross Kinnaird/Getty Images)

The 32-year-old hasn't played for West Brom since September due to a nagging Achilles injury but was back in full training towards the end of the campaign.

He was a regular for the Baggies when Pulis was in charge and West Brom's longest serving player has been top class for Albion over the years.

But with his contract up, is it time to move on? And could Pulis be interested in a reunion as he looks to add some more craft to his midfield?

Robert Huth

(Centre-back, 33, Leicester)

Football Terminator Robert Huth never featured last term after ankle surgery but before that had been a fixture in the fantastic Foxes fairytale title win playing over 30 games in successive seasons.

The one time Boro man is strong, dominant, experienced and has a will to win and the grappling qualities to tame the toughest of targetmen. And Pulis knows all about his qualities after six successful years at stoke.

He is at the veteran stage but if fit could add nous and leadership to the Boro backline.

Robert Huth poses with the Premier League trophy (Image: Getty Images)

And one from the Championship....

Andreas Bjelland

(Centre-back, 29, Brentford)

The strapping stopper has rejected a new deal at Brentford and wants a fresh challenge at a bigger, more ambitious club.

Word in London suggests he has had a few nibbles but will put any interest on hold until after the World Cup. He has 28 caps for Denmark and is in their provisional squad.

Bjelland joined the Bees from Twente in 2015 and was injured on his debut and lost a year but has played 61 times since then and has won rave reviews for his composure and tackling. He can also play in either full-back role or in midfield.

He is athletic, versatile and ambitious and he knows what the Championship is all about. He may be a good fit.